indissoluble
in.dis.sol.u.ble \-'a:l-y*-b*l\ \-ble-\ aj : not dissoluble : as :
incapable of being annulled, undone, or broken : PERMANENT { an ~ contract}
: incapable of being dissolved, decomposed, or disintegrated -
in.dis.sol.u.ble.ness n
Webster's English Dictionary